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Synchronous Client Server Application in C#

By 
Pavithra Gunasekara user avatar
Pavithra Gunasekara
·
Aug. 05, 12 · Interview
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TCP Based Server

  • Establish the local end point for the socket
  • Open a socket using Socket()
  • Name the socket using Bind()
  • Listen for incoming connections using Listen(), parameter inside the method specifies the maximu number of pending connections
  • Accept client connections using Accept(), a new socket is created here but the original socket keeps listen
  • Send, Receive data using Send() and Receive()
  • Close Socket using Close()

Server.cs
   using System; 
   using System.Net.Sockets; 
   using System.Net; 
   using System.Text; 

   public class SocketServer 
   { 
      public static void Main(string [] args) 
      { 

         // establish the local end point for the socket 
         IPHostEntry ipHost = Dns.Resolve("localhost"); 
         IPAddress ipAddr = ipHost.AddressList[0]; 
         IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 11000); 

         // create a Tcp/Ip Socket 
         Socket sListener = new Socket(AddressFamily.InterNetwork, 
                                       SocketType.Stream, ProtocolType.Tcp); 

         // bind the socket to the local endpoint and 
         // listen to the incoming sockets 

         try 
         { 
            sListener.Bind(ipEndPoint); 
            sListener.Listen(10); 

            // Start listening for connections 

            while (true) 
            { 
               Console.WriteLine("Waiting for a connection on port {0}",ipEndPoint); 

               // program is suspended while waiting for an incoming connection 
               Socket handler = sListener.Accept(); 

               string data = null; 

               // we got the client attempting to connect 
               while(true) 
               { 
                  byte[] bytes = new byte[1024]; 

                  int bytesRec = handler.Receive(bytes); 

                  data += Encoding.ASCII.GetString(bytes, 0, bytesRec); 

                  if (data.IndexOf("<theend>") > -1) 
                  { 
                     break; 
                  } 
               } 

               // show the data on the console 
               Console.WriteLine("Text Received: {0}",data); 

               string theReply = "Thank you for those " + data.Length.ToString() 
                               + " characters..."; 
               byte[] msg = Encoding.ASCII.GetBytes(theReply); 

               handler.Send(msg); 
               handler.Shutdown(SocketShutdown.Both); 
               handler.Close(); 
            } 
         } 
         catch(Exception e) 
         { 
            Console.WriteLine(e.ToString()); 
         } 

      } // end of Main 
   } 


TCP Based Client

  • Establish a remote endpoint
  • Open a socket using Socket()
  • Connect to the remote host using Connect
  • Send, receive data using Send() and Receive()
  • Close Socket using Close()

Client.cs
using System; 
using Systern.Net.Sockets; 
using Systern.Net; 
using Systern.Text; 

public class SocketClient 
{ 
   public static void Main(string [] args) 
   {

    // data buffer for incoming data 
    byte[] bytes = new byte[1024]; 

    // connect to a Remote device 
    try 
    { 
       // Establish the remote end point for the socket 
       IPHostEntry ipHost = Dns.Resolve("127.0.0.1"); 
       IPAddress ipAddr = ipHost.AddressList[0]; 
       IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 11000); 

       Socket sender = new Socket(AddressFamily.Internetwork, 
                                  SocketType.Stream, ProtocolType.Tcp); 

       // Connect the socket to the remote endpoint 

          sender.Connect(ipEndPoint); 

          Console.WriteLine("Socket connected to {0}", 
          sender.RemoteEndPoint.ToString()); 

          string theMessage = "This is a test"; 

          byte[] msg = Encoding.ASCII.GetBytes(theMessage+"<theend>"); 

          // Send the data through the socket 
          int bytesSent = sender.Send(msg); 

          // Receive the response from the remote device 
          int bytesRec = sender.Receive(bytes); 

          Console.WriteLine("The Server says : {0}", 
                            Encoding.ASCII.GetString(bytes,0, bytesRec)); 

          // Release the socket 
          sender.Shutdown(SocketShutdown.Both); 
          sender.Close(); 

    } 
    catch(Exception e) 
    { 
       Console.WriteLine("Exception: {0}", e.ToString()); 
    } 
  } 
} 


Fllowing image shows how client and server send and receive data


application

Published at DZone with permission of Pavithra Gunasekara, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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